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4*(x/5-2) = 20 // - 20
4*(x/5-2)-20 = 0
4*(1/5*x-2)-20 = 0
4*(1/5*x-2)-20 = 0
4/5*x-28 = 0
4/5*x-28 = 0
4/5*x-28 = 0 // + 28
4/5*x = 28 // : 4/5
x = 28/4/5
x = 35
x = 35
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